there is a 1878 8TF, 7/8TF, B1 reverse that is 7Tf with a long nock(1st reverse) and 7TF that is a short nock(2nd reverse) and a 7TF that has the top feather of 79 so its slanted instad of flat like the rest of them in 78 (this is the 3rd Reverse)
So in a nut shell, the long nocks (8TF,7/8TF,B1 Reverse) are all type 1
7TF with short nock is 2nd Reverse
Reverse of 79 is the 3rd reverse